Apple offers no end-of-life roadmaps for its operating systems, and it doesn't officially comment on whether support has dried up for this or that version of OS X. The best you can do is look at historical data. Since switching to a yearly release cadence with Lion back in 2011, Apple seems to be willing to support whatever the latest version is plus the two preceding versions. When OS X 10.9.2 was released earlier this week, it was accompanied by security updates for OS X 10.8 and 10.7 but not for 2009's OS X 10.6.

It's the first major security update that Snow Leopard has missed—the OS is still getting iTunes updates, but its last major security patch happened back in September. This has prompted a flurry of posts from various outlets. All point out the same Net Applications data that says 10.6 still powers around 19 percent of Macs. Most compare the OS X support cycle to the much-longer Windows cycle. Some make a bigger deal about it than others. None really tell anyone in that 19 percent what to do next.